Feed reverse and stitch regulating attachment for sewing machines



v Aug. 26, 1947. M. lNGWER 2,426,506

FEED REVERSE AND STITCH REGULATING ATTACHMENT FOR SEWING MACHINES FiledFeb. 16, 1945 IN V EN TOR. Wax Man 5? Patented Aug. 26, 1947 UNITEDSTATES PATENT OFFICE Max IngWer, New York, N. Y., assignor to'Con-.solidated Sewing Machine & Supply 00., Inc.,

New York, N. Y., a corporation of New York Application February 16,1945, Serial No. 578,182

2 Claims.

The inver'ltio'n here disclosed relates to stitch regulation and reversefeed of sewing machines.

Objects of the invention are to provide means in the nature of anattachment or accessory by which an ordinary, non-reversin sewingmachine can be quickly and easily converted to a reverse feed machineand to provide desired stitch regulation in both directions.

Special objects are to enable such a conversion and addition withoutdisturbing, impairing or changing any of the other parts or altering theproper operating characteristics of the machine.

Further objects are to provide anattachment of the nature indicatedwhich will make use, so far aspossible, of the conventional portions ofthe machine and require simply the replacement'and addition of but fewand relatively inexpensive parts.

Other objects are to'provide mechanism of the character indicated whichwill lainly show at alltimes just how the machine is set, as to lengthor number of stitches and direction of feed.

Other desirable objects and the novel features by which the purposes ofthe invention are attained will appear or are set forth in the course ofthe following specification.

The drawing accompanying and forming part of the specificationillustrates present practical embodiments of the invention. Structure,however, may be modified and changed as regards the presentillustration, all Within the true intent and broad scope oftheinve'ntion as'hereinafter clefined and claimed,

Fig. 1 in the drawing is a broken front view of a sewing machine ofconventional design having the invention applied thereto;

Fig. 2 is a broken end and part sectional view as on substantially theplane of line 2-2 of Fig.

Fig. 3 is a Vertical sectional View as on substantially the plane ofline 33 of Fig. 1;

Fig. 4 is a broken sectional view as on substantially the plane of line44 of Fig. 3;

Fig. 5 is a broken sectional detail of a modification.

In the several views the head portion of a sewing machine of more orless standard and conventional design is illustrated embodyin a hollowcolumn or standard 1 rising from a bed plate 8 and carrying theoverhanging arm 9 in which the main shaft 10 is journalled.

Th rock shaft which actuates the feed mechanism is shown at H, Fig. 3,having a rock arm l2 which is actuated from an upright link l3 disposedwithin the hollow column. "Osbillati'ng movements are imparted to theupper end of this link by cam on the shaft l 8 e'ngage'd'by a yoke 55 onthe upper end of the link. Near its upper end the link carries a rollerIt engaged-in a groove in the face of a guide block or shoe. Theinclination of :this guide groove determine'sthe vertical 'reciprocatorystroke of the link and hence the extent of feed movement imparte'd'to'the rock shaft I I.

In the more or less conventional type of domestic sewing machine theshoe for determining the up and down stroke of the feedmechani's'mactuating link l3 iss'crewe'd. fast on the inner end of a stud pivotallyengaged inabearinghole ll, Fig. 4, in the side'or end wall of thetubular column. Also, in the conventional machine the guide shoe has adependent "leverage extension or arm engaged and held between the spacedshoulders i8, Fig. 3, of a regulating screw "IQ-extending in through ascrew holeZiJ in the front'of the hollow column.

Under the'present invention conversion to'reverse feed and stitchregulation 'is accomplished by removing the screw stud ordinarilyjournaled in the bearing hole 1 i, Fig. 4, taking'out-the regular shoesupported on the inner end of that screw stud and replacing these partswith a special *headed stud 2l,-Fig. l, which will turn in the passagell and with a plain grooved shoe 22'screwed fast at 23 on the'innerend-of-the rotatably supported stud 2 l The substitute, rotatablyadjustable stud 2! has an elongated operating head 24 atthe outer end ofthe same, providing a means for connection of ascrew rod Eiformingalever for positively turning the stud and the shoe fixedly mounted onthe inner end of the same.

The adjustinglever 25'is shown'as projecting forwardly at the front ofthe machine where it can be easily reached by the operator, and asadapted to be secured in adjusted relation by a clamp nut 26 engageablewith a plate or segment 21.

The part last mentioned is shown in Figs. 1 and 4 as slotted at 28 forpassage of the adjusting lever 25 and as equipped with indications suchas 29 which, in association with the lever, will show the length ofstitch and the direction of feed for which the machine is set.

A further special feature of the invention is that the dial or indexplate 21 is equipped with backwardly bent ears or flanges 30 forpositioning it over the boss 3| usually present on the front of thecolumn about the screw passage 29 and with a central opening 32 forpassage of the regulator screw I9. This enables the regulator screw, tobe replaced in the screw passage, over the perforated base portion ofthe dial and turned all the way in as in Figs. 2 and 3, to firmly andrigidly secure the dial in proper position for its cooperation with theadjusting lever 25. When thus turned all the way in and used as a clampscrew for securing the dial plate, the inner end of the regulator screwwill project to substantially the full limit within the upright columnbut this, under the replacement conditions, is of no objection becausethis screw has no connection with the replacement shoe, the latter, asbest shown in Figs. 3 and l, being free of any downward pro jectionwhich might strike or be engaged by the regulator or present utilizedclamping screw IS.

The mounting of the substitute guide shoe as a fixed element on theinner end of the replacement stud 2| and the turning of this stud byprojecting lever 25 provides a range of adjustment sufiicient to carrythe operation of the link l3 from a full stroke forward feed movement,through successively shorter and finally to reverse feed operations and,if desired, by a single continuous or instant adjustment of the singlelever 25 and while the machine is either stationary or running. At'

any point in such range of adjustment the lever may be stopped andsecured or be left free so that it may be instantly set back or changedat any time. The dial is in full plain sight of the operator and thusmay serve as a constant guide and indication of the condition of partsand present operating effect of the machine.

The substitute parts are simple and inexpensive, rugged in character andreadily substituted by anyone at all familiar with ordinar ewingmachines, and with a screw driver as the only necessary tool.

Structure may be modified and changed in various ways. Thus, as shown inFig. 5, an ordinary standard machine screw 25a may be substituted forthe screw rod forming the adjusting lever 25 and the head of suchmachine screw be hidden within a hollow thumb nut 26a elongated andchambered at 33 to accommodate and conceal the head of such screw. Thiselongated thumb nut may be knurled on the outside to serve as aconvenient grip and lever handle for shifting and securing the parts,

The screw rod 25 first shown may have a flattened outer end it for afinger grip and be secured in proper position in the operating head 24by a lock nut ll.

To yieldingly retain the parts in adjusted relation a spring washer 42may be located under the operating head 24 of the pivoted stud 2| Theinvention makes it possible to quickly and inexpensively convert asewing machine originally built for forward stitching only into oneuseable for sewing in the reverse direction also and without anymachining, welding, drillin or other operations on the machine head oron the members designed and cooperating to form the actual sewingmechanism.

What is claimed is:

1. A reverse feed and stitch regulator mechanism for a conventionalsewing machine having a column in which a main shaft is journaled andwhich column has a bearing aperture with an axis 7 parallel to the mainshaft and a screw hole with an axis at right angles to the main shaft,said mechanism including a stud rotatably extending in through saidbearing aperture and having a head at the outer end outside the columnand a uide shoe fixedly mounted on the inner end of of said dialmounting screw.

2. A reverse feed and stitch regulator mechanism for a conventionalsewing machine having a column with a main shaft journaled therein andhaving a bearing apelture in the wall of the column whose axis isparallel to the main shaft and comprising a supporting stud for pivotalmounting in said bearing aperture, a guide shoe grooved for reception ofa roller, at the inner end of said pivotally mounted stud and having afixed screw connection therewith, said stud havin an elongated operatinghead at its outer end outside the column, a radially projecting, headed,leverforming machine screw screwed fast into said operating head, athumb nut 0n the shank of said machine screw and having an elongatedtubular finger grip extension enclosing the head of said screw and anindicating dial segment slotted for the passage of the shank of saidscrew and engageable by the inner end of said thumb nut lever operatinggrip.

MAX inowna.

REFERENCES CITED FOREIGN PATENTS Country Date Germany Sept. 23, 1962Number 133,870

